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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dde9038584682fd086c1a4965ec437dc488cc741c22b36f265b4f557fdab6fa' 
  AND token = 'MuuaFt+f1w+tvM5DJWUmkhJDLneB4f+J6ktDH2qqQB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}